| Date | IP Address |
| 2022-06-17 | 184.31.72.84 (ClassC) |
| 2023-08-25 | 23.5.254.84 (ClassC) |
| 2023-12-27 | 184.25.210.59 (ClassC) |
| 2024-06-23 | 23.6.110.10 (ClassC) |
| 2024-10-16 | 23.64.119.54 (ClassC) |
| 2025-06-19 | 23.213.53.76 (ClassC) |
| 2025-07-09 | 23.41.4.77 (ClassC) |
| 2025-09-21 | 23.46.17.186 (ClassC) |
| 2025-11-22 | 23.41.4.86 (ClassC) |
| Date | Domain | IP |
| apps2.irs.gov | 2014-05-11 | 198.47.108.64 |
| la1.www4.irs.gov | 2023-08-25 | 104.86.253.111 |
| sa1.www4.irs.gov | 2023-08-25 | 104.86.253.151 |
| la2.www4.irs.gov | 2023-08-25 | 104.86.253.111 |
| sa2.www4.irs.gov | 2023-08-25 | 104.86.253.151 |
| la3.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| sa3.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la4.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| sa4.www4.irs.gov | 2023-08-25 | 104.86.245.147 |
| la.www4.irs.gov | 2023-08-25 | 104.86.253.111 |